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# Physical Sci 7th gr

### Ch 5

TermDefinition
Fluid substance that flows and takes the shape of the container that holds it
Liquid matter with a definite volume but no definite shape
Gas matter that has no definite volume and no definite shape
Archimedes Principle states that the buoyant force on an object is equal to the weight of the fluid that the object displaces
Buoyancy force `upward force applied by a fluid on an object in the fluid
Pascal's principle states that when pressure is applied to a fluid in a closed container, the pressure increases by the same amount everywhere in the container
Bernoulli's principle states that the pressure of a fluid decreases when the speed of that fluid increases
Drag force force that opposed the motion of an object through a fluid
Pressure amount of force per unit area applied to an object's surface
Density mass per unit volume of a substance
Work transfer of energy that occurs when a force is applied over a distance
Power the rate at which work is done
Force push or a pull on an object
Fulcrum the point where a lever pivots
Gravity an attractive force that exists between all objects that have mass
Friction a contact force that resists the sliding motion of two surfaces that are touching
Inertia tendency of an object to resist a change in its motion
Momentum measure of how hard it is to stop a moving object
Displacement difference between the initial, or starting, position and the final position of an object that has moved
Inquiry an investigation
Control Group the part of an experiment that contains the same factors as the experimental group but the independent variable is not changed
Constant factors in an experiment that remain the same
Dependent variable the factor a scientist observes or measures during an experiment
Independent variable the factor that is changed by the scientist to observe how it affects a dependent variable
Hypothesis a possible explanation for an observation that can be tested by scientific investigations
Created by: TinaPysz

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